Calendar



FIG. 1 is a front perspective view of a calendar showing my new design;

FIG. 2 is a top end view thereof;

FIG. 3 is a bottom end view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a side elevational view thereof, it being understood that both sides are identical; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a calendar, as shown and described. 